Update README.md

Signed-off-by: Zoltán Böszörményi <[email protected]>

Author: zboszor

README.md

@@ -15,17 +15,22 @@ You will need to enable FORTRAN support by adding the following to your
 
     FORTRAN:forcevariable = ",fortran"
     RUNTIMETARGET:append:pn-gcc-runtime = " libquadmath"
+    HOSTTOOLS += "gfortran"
 
-If you're using a custom distribution, you can alternatively include the two
+If you're using a custom distribution, you can alternatively include the
 above lines in your `distro.conf` file.
 
+The OpenBLAS recipe in this layer has its default configuration carried
+over from [meta-scikit-learn](https://github.com/tuxable-ltd/meta-scikit-learn).
+But it is not enough to satisfy the `python3-scipy` recipe. To allow
+`python3-scipy` build and work, this settings is needed in an
+`openblas_%.bbappend`:
+
+    PACKAGECONFIG = "lapack cblas affinity dynarch"
+
 The recently added `python3-llvmlite` (https://pypi.org/project/llvmlite/)
 recipe needs LLVM 14.x but can also build with LLVM 15.x as an experimental
 change. The llvmlite project is quite slow to adopt newer LLVM versions,
 so if you need this package and want to build it in Yocto 4.3 or newer,
-then please use these branches from the forked https://github.com/zboszor/meta-clang
-until the relevant pull requests are merged:
-
-* `nanbield-add-clang15` (https://github.com/kraj/meta-clang/pull/988)
-* `scarthgap-add-clang15` (https://github.com/kraj/meta-clang/pull/989)
-* `master-add-clang15` (https://github.com/kraj/meta-clang/pull/990)
+then please use [meta-clang-revival](https://github.com/zboszor/meta-clang-revival)
+in your manifest.